when white light enters a prism, it gets split into its constituent colours. this is due to

When white light enters a prism, it splits into its constituent colors due to the phenomenon called dispersion of light. This happens because different colors (wavelengths) of light have different refractive indices in the prism material, which means they travel at different speeds inside the prism. As a result, each color bends (refracts) by a different amount when passing through the prism, causing the white light to spread out into its spectrum of colors. In summary, the splitting of white light into its constituent colors in a prism is due to the different refractive indices for different colors and their resulting different angles of deviation caused by refraction inside the prism.